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United States Patent | 5,329,572 |
Martens | July 12, 1994 |
A telephone exchange provides dial-up switched connections for customers' broadband data terminal equipment (DTE). In response to data received over an associated narrowband channel, the exchange establishes a broadband transmission path to a broadband DTE associated with the narrowband channel. Upon receiving a number for the called party broadband DTE over the narrowband channel, the switch establishes an interoffice broadband channel for communications between the originating and destination DTE.
Inventors: | Martens; Gregory A. (Palos Hills, IL) |
Assignee: | AT&T Bell Laboratories (Murray Hill, NJ) |
Appl. No.: | 951494 |
Filed: | September 24, 1992 |
Current U.S. Class: | 348/14.11; 370/358; 370/360; 379/229; 379/258 |
Intern'l Class: | H04M 011/00 |
Field of Search: | 370/58.1,58.2,58.3,94.1,60,62,60.1,68.1,110.1,69.1,71,85.7,85.9 ;245;246;258;272;90 379/219,220,221,222,224,225,226,227,229,230,231,232,233,234,235,237,240,242,243 |
4704716 | Nov., 1987 | Bowers et al. | 370/112. |
4805166 | Feb., 1989 | Ardon et al. | 370/58. |
4811335 | Mar., 1989 | van Baardwijk et al. | 370/63. |
4897867 | Jan., 1990 | Foster et al. | 379/246. |
5008884 | Apr., 1991 | Yazawal et al. | 370/58. |
5014206 | May., 1991 | Bales et al. | 370/58. |
5042062 | Aug., 1991 | Lee et al. | 379/54. |
5063592 | Nov., 1991 | Cannella et al. | 370/219. |
5115426 | May., 1992 | Spanke | 370/60. |
5115427 | May., 1992 | Johnson, Jr. et al. | 370/60. |
5138657 | Aug., 1992 | Colton et al. | 379/220. |
5200996 | Apr., 1993 | Beierle | 370/110. |
5212691 | May., 1993 | Hokani | 379/221. |
5231631 | Jul., 1993 | Buhrke et al. | 370/110. |
Foreign Patent Documents | |||
0119843 | Mar., 1984 | EP | . |